java.util.ConcurrentModificationException while Inserting the values in arrayList

Question

javax.faces.FacesException: #{scheduleBean.insert()}: java.util.ConcurrentModificationException
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.el.EvaluationException: java.util.ConcurrentModificationException

Code:

 public void insert(){

       for(ScheduleMaster v:arrayList1){

           arrayList1.add(mm.i, v); 
       }           
       List<ScheduleMaster>temp1=new ArrayList<ScheduleMaster>();
       temp1=arrayList1;
       System.out.println("Coming Insert");
       Iterator<ScheduleMaster>itr=temp1.iterator();
         while(itr.hasNext()){
             ScheduleMaster s=itr.next();
             s.setServiceCode(serviceCode);
             s.setServiceName(serviceName);
             s.setVessalCode(vessalCode);
             s.setVessalName(vessalName);
             s.setVoyage(voyage);
             s.setPortCode(portCode);
             s.setPortName(portName);
             s.setTerminalCode(terminalCode);
             s.setTerminalName(terminalName);
             s.setEta(eta);
             s.setEtaTimes(etaTimes);
             s.setEtd(etd);
             s.setEtdTimes(etdTimes);
             s.setBound(bound);
             s.setAta(ata);
             s.setAtaTimes(ataTimes);
             s.setAtd(atd);
             s.setAtdTimes(atdTimes);
             arrayList1.add(s);                        

       } 

   }

This is not a well defined question, only a stacktrace and a code snippet. And also it seems a duplicate question. — Ricardo Vila, Aug 12 '15 at 07:53

score 2 · Answer 1 · answered Aug 12 '15 at 07:05

temp1 and arrayList1 is the reference to the same object. And you cannot iterate over an object and change it while iteration.

So you have to clone the object and then you can iterate over the clone and change the original.

  List<ScheduleMaster>temp1=new ArrayList<ScheduleMaster>();
  for(ScheduleMaster v:arrayList1){

       arrayList1.add(mm.i, v); 
       temp1.add(mm.i, v); 
   }

java.util.ConcurrentModificationException while Inserting the values in arrayList

1 Answers1